Abstract
A non-noble-metal catalyst composed of Fe, C and N was prepared by two-step pyrolysis of blood protein as the precursor. The structure and electrocatalytic activity for the oxygen reduction reaction of the prepared catalysts were investigated, and the influence of pyrolysis process on the catalytic performance of the catalysts was analyzed. The results indicated that the obtained catalyst, which was prepared at 300 and 900℃ for two hours, respectively, has excellent electrocatalytic performance for the oxygen reduction and selectivity of four electron reaction pathways. The onset potential for the oxygen reduction is 0.55 V and the electron transfer number is 3.7. The pyrolysis process from one-step to two-steps has changed the the properties of the matrix and the graphitization degree of the product, which helps to the doping of nitrogen atoms and the formation of a high percentage of pyridinic-N and Fe-N x structures. It has enhanced the electrocatalytic performance for the oxygen reduction of the product in acidic media.
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